/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.examples.client;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;
import java.net.SocketTimeoutException;

import org.apache.http.HttpHost;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

/**
 * How to send a request via SOCKS proxy.
 *
 * 4.1
 */
public class ClientExecuteSOCKS {
	
	public static void main(String[] args) throws ClientProtocolException, IOException {
		Registry<ConnectionSocketFactory> reg = RegistryBuilder.<ConnectionSocketFactory>create().register("http", new MyConnectionSocketFactory()).build();
		PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(reg);
		CloseableHttpClient httpclient = HttpClients.custom().setConnectionManager(cm).build();
		try {
			InetSocketAddress socksaddr = new InetSocketAddress("mysockshost", 1234);
			HttpClientContext context = HttpClientContext.create();
			context.setAttribute("socks.address", socksaddr);
			
			HttpHost target = new HttpHost("localhost", 80, "http");
			HttpGet request = new HttpGet("/");
			
			System.out.println("Executing request " + request + " to " + target + " via SOCKS proxy " + socksaddr);
			CloseableHttpResponse response = httpclient.execute(target, request, context);
			try {
				System.out.println("----------------------------------------");
				System.out.println(response.getStatusLine());
				EntityUtils.consume(response.getEntity());
			} finally {
				response.close();
			}
		} finally {
			httpclient.close();
		}
	}
	
	static class MyConnectionSocketFactory implements ConnectionSocketFactory {
		
		@Override
		public Socket createSocket(final HttpContext context) throws IOException {
			InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
			Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
			return new Socket(proxy);
		}
		
		@Override
		public Socket connectSocket(final int connectTimeout, final Socket socket, final HttpHost host, final InetSocketAddress remoteAddress, final InetSocketAddress localAddress, final HttpContext context) throws IOException, ConnectTimeoutException {
			Socket sock;
			if (socket != null) {
				sock = socket;
			} else {
				sock = createSocket(context);
			}
			if (localAddress != null) {
				sock.bind(localAddress);
			}
			try {
				sock.connect(remoteAddress, connectTimeout);
			} catch (SocketTimeoutException ex) {
				throw new ConnectTimeoutException(ex, host, remoteAddress.getAddress());
			}
			return sock;
		}
		
	}
	
}
